CN109932169B - Mechanical seal test device with adjustable seal ring axis deflection angle - Google Patents
Mechanical seal test device with adjustable seal ring axis deflection angle Download PDFInfo
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- CN109932169B CN109932169B CN201910276421.XA CN201910276421A CN109932169B CN 109932169 B CN109932169 B CN 109932169B CN 201910276421 A CN201910276421 A CN 201910276421A CN 109932169 B CN109932169 B CN 109932169B
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Abstract
The invention relates to a mechanical seal test device with an adjustable seal ring axial deflection angle, and belongs to the field of seal test equipment. The mechanical seal test device comprises a test cavity provided with a seal test chamber and a rotary seal main shaft; the rotary seal main shaft is sleeved in the seal test chamber, one side of the rotary seal main shaft is sealed by the auxiliary mechanical seal assembly, and the other side of the rotary seal main shaft is sealed by the mechanical seal assembly to be tested; a mechanical seal mounting flange is mounted at the shaft end of the mounting shaft hole at the other side through a plurality of uniformly distributed fixing bolts; a static ring seat is sleeved in the mechanical seal mounting flange, and a movable ring seat is sleeved outside the rotary seal main shaft; and a flange disc group for adjusting the axial deflection angle is pressed between the mechanical seal mounting flange and the end surface of the shaft end in a watertight manner, and through holes for fixing bolts to pass through are formed in flange discs in the flange disc group. The mechanical sealing performance under the working condition of the axial deflection angle of the sealing ring can be tested by adjusting the relative corner positions of the two flanges, and the device can be widely applied to the field of testing of the sealing performance.
Description
Technical Field
The invention relates to mechanical seal test equipment, in particular to a mechanical seal test device with an adjustable seal ring axial deflection angle.
Background
The mechanical seal is used as an important accessory in industrial application and widely applied to various rotary machines such as centrifugal pumps, centrifuges, reaction kettles, compressors and the like. Once the mechanical seal breaks down, leakage can be caused, so that the mechanical seal is directly related to the running reliability and the working period of equipment, and has great significance for avoiding the aspects of environmental pollution, energy waste, property loss, safety accidents and the like.
The development of the current mechanical sealing technology is still in a combined stage of theory and practice, and in practical application, the design parameters of the mechanical sealing are greatly dependent on the statistical analysis of experience accumulation and experimental technology. Due to the particularity and the universality of the work, the mechanical seal usually works under the unstable working condition and is subjected to large instant impact, and the reliability of the combined mechanical seal under the unstable working condition cannot be obtained by theoretical calculation and is usually verified based on a test.
In addition, the working environment of the mechanical seal is obviously different from the working process of a steady-state process due to the fact that the rotation speed and pressure changes such as stopping and starting are large in the working process, and therefore the environmental adaptability of the seal needs to be investigated by corresponding test equipment. For example, a mechanical seal transient start/stop sealing performance testing apparatus disclosed in patent document CN101464203A is used to test the transient start/stop sealing performance. The test device comprises a power system, a main body sealing installation platform and a data acquisition system; wherein, driving system includes rotary driving motor and rotary seal main shaft, main part seal installation platform is including having the sealed experimental cavity who stretches into side-mounting shaft hole and stretch out side-mounting shaft hole, the one end of rotary seal main shaft is passed through shaft coupling and rotary driving motor's rotor shaft and is connected in order to accept this rotary driving motor drive and rotatory, the other end passes in proper order and stretches into side-mounting shaft hole and stretch out side-mounting shaft hole, seal with by supplementary mechanical seal subassembly between rotary seal main shaft and stretch into side-mounting shaft hole, stretch out and seal by the mechanical seal subassembly that awaits measuring between side-mounting shaft hole and the rotary seal main shaft, the seal subassembly that awaits measuring is including installing the quiet ring on stretching out side-mounting shaft hole and installing the rotating ring on rotary seal main shaft.
In the above patent document, an energy storage flywheel is provided to better simulate the start-stop transient process. However, in the installation process of the mechanical seal, the installation precision is difficult to control, so that a deflection angle exists between the axes of the seal rings, namely, the axis of the movable seal ring and the axis of the static seal ring do not intersect to form an included angle which is larger than zero degree; in addition, when the perpendicularity of the end surfaces of the two sealing rings is insufficient in machining precision, the problem that the axes of the sealing rings have deflection angles is caused; the existing deflection angle between the axes of the two sealing rings can shorten the service life of the mechanical seal and even can cause the failure of the mechanical seal. The existing test device is difficult to effectively test the mechanical sealing performance of the mechanical sealing ring assembly under the working condition that the axis has a deflection angle.
In addition, the testing device can not effectively test other parameters such as displacement and movement measurement of the sealing ring and the like on the mechanical sealing performance under the variable-temperature working condition.
Disclosure of Invention
The invention mainly aims to provide a test device capable of testing the mechanical sealing performance of a sealing ring under the eccentric working condition.
In order to achieve the main purpose, the mechanical seal testing device with the adjustable axial deflection angle of the sealing ring provided by the invention comprises a data acquisition system, a testing cavity provided with a sealing testing chamber, a rotary seal main shaft and a rotary driving motor for driving the rotary seal main shaft to rotate; the rotary seal main shaft is sleeved in the seal test chamber, and the rotary seal main shaft are sealed by the auxiliary mechanical seal assembly at the mounting shaft hole at the extending side of the chamber and are sealed by the mechanical seal assembly to be tested at the mounting shaft hole at the extending side of the chamber; a mechanical seal mounting flange is detachably mounted at the shaft end of the shaft hole at the extending side through a plurality of fixing bolts uniformly distributed around the axis of the rotary seal main shaft; the mechanical seal mounting flange is internally detachably and watertight sleeved with a static ring seat for mounting a static ring to be tested; the rotating seal main shaft is externally detachably and watertight sleeved with a movable ring seat for mounting a movable ring to be tested; the mechanical seal mounting flange and the end face of the test cavity are watertight pressed to form a flange disc group used for adjusting the axial deflection angle, when two flange discs in the flange disc group rotate relatively until the axial deflection angle between the two flange discs is zero, the deflection angle exists between the normal direction of the contact end face and the axial of the rotary seal main shaft, and through holes for fixing bolts to penetrate through are formed in the flange discs.
Through setting up adjustable flange dish group to adjust the rotation angle that one of them ring flange used the axis as the center of rotation as required, in order to promote the axis deflection of mechanical seal mounting flange relative rotary seal main shaft and make the declination between the two adjust, in order to adjust the declination between the axis of the quiet ring that awaits measuring and the rotating ring that awaits measuring, and acquire the axis declination of corresponding sealing ring, in order to test the mechanical seal performance under the eccentric operating mode of sealing ring, and this declination can be adjusted from 0 degree, overall structure is simple.
The specific scheme is that a shaft sleeve is detachably sleeved outside the rotary sealing main shaft, and a movable ring seat is detachably sleeved outside the shaft sleeve. By additionally arranging the shaft sleeve, mechanical seal assemblies to be tested with different specifications can be tested on the same rotary seal main shaft.
The more specific scheme is that the shaft sleeve comprises an inner shaft sleeve which is detachably sleeved outside the rotary seal main shaft and an outer shaft sleeve which is detachably sleeved outside the inner shaft sleeve; the movable ring seat is detachably sleeved outside the outer shaft sleeve; the thickness of the outer shaft sleeve is smaller than that of the inner shaft sleeve. Through setting up the outer layer biax cover structure in, can further adapt more specifications of the mechanical seal subassembly that awaits measuring.
A first sealing sleeve ring is pressed between the inner shaft sleeve and a shaft shoulder on the rotary sealing main shaft, an elastic sealing ring is pressed between the first sealing sleeve ring and the outer peripheral surface of the rotary sealing main shaft, a sealing gasket is pressed between the first sealing sleeve ring and the inner end surface of the inner shaft sleeve, and a locking nut pressed on the outer end surface of the inner shaft sleeve is screwed at the outer end part of the rotary sealing main shaft; the wall parts at two ends of the sleeve cavity of the outer sleeve are supporting sleeving parts with inward convex structures, and an installation gap is reserved between the wall surface of the sleeve between the two supporting sleeving parts and the outer peripheral surface of the inner sleeve, so that the assembly difficulty can be effectively reduced, and the installation positioning precision is improved; a second sealing lantern ring is pressed between the outer shaft sleeve and a shaft shoulder on the inner shaft sleeve, an elastic sealing ring is pressed between the second sealing lantern ring and the outer peripheral surface of the inner shaft sleeve, and a sealing gasket is pressed between the second sealing lantern ring and the inner end surface of the outer shaft sleeve; the outer end of the inner shaft sleeve is screwed with a locking nut which is pressed on the outer end surface of the outer shaft sleeve.
In the preferred scheme, in the flange plate group, a sealing washer is pressed between the ring surface of the fixed flange plate and the end surface of the test cavity, a sealing washer is pressed between the ring surface of the adjusting flange plate and the end surface of the mechanical seal mounting flange, and a sealing washer is pressed between the ring surfaces of the two flange plates; the abutting part of the fixed flange and the test cavity is concavely provided with a gasket mounting groove, and the abutting part of the mechanical seal mounting flange and the adjusting flange is concavely provided with a gasket mounting groove. The sealing structure is simple, low in cost and effective.
Another preferred scheme is that the number of the fixing bolts is more than ten; and taking the axis as the normal line of the circle passing through the center of the circle where the central angle is located, wherein the central angle of two adjacent fixing bolts is an integral multiple of the central angle of two adjacent through holes on the flange plate. The flange plate group is set to be an integral multiple structure, and the requirements of different adjustment precisions can be realized only by replacing the flange plate group on the premise of not replacing other structures.
Another preferred scheme is that the rotary driving motor is connected with the inner end part of the rotary sealing main shaft through a coupler and a clutch which are sequentially arranged, a flywheel is arranged between an input shaft of the clutch and a rotor shaft of the rotary driving motor, a rotating speed and torque tester is arranged between the coupler and an output shaft of the clutch, and a supporting bearing mechanism is arranged on the shaft end side of the rotary sealing main shaft in the test cavity; the supporting bearing mechanism comprises a supporting bearing sleeved outside the rotary sealing main shaft and a bearing seat connected with the test cavity, and a circulating cooling water channel is arranged in the bearing seat.
The more preferable scheme is that the input shaft end of the coupler and the output shaft end of the clutch and/or the input shaft end of the flywheel and the output shaft end of the rotor of the rotary driving motor are in rotation transmission connection by an axial displacement isolating mechanism; the axial displacement isolating mechanism comprises an inner spline housing and an outer spline housing which are matched; one of the adjacent input shaft end and the output shaft end is fixedly connected with the internal spline sleeve, and the other one is fixedly connected with the external spline sleeve.
Another preferred scheme is that a temperature monitoring sensor and a water pressure monitoring sensor with detection ends positioned in the sealed test chamber are arranged on the test chamber body in a watertight manner.
More preferably, a spare sealing assembly is arranged between the outer end of the mechanical seal mounting flange and the outer end of the rotary seal main shaft; the static ring seat is detachably arranged on the mechanical seal mounting flange through the matching of the pressure ring and fastening bolts arranged along the axial direction of the rotary seal main shaft, the static ring seat is provided with a first sleeving ring part sleeved in an inner cavity of the mechanical seal mounting flange, an elastic sealing ring is pressed between the outer peripheral surface of the first sleeving ring part and the mechanical seal mounting flange, an inner shaft shoulder is convexly arranged in the inner cavity of the static ring seat, an adjusting ring seat and a spring ring seat are sleeved between the inner shaft shoulder and the pressure ring in a sleeved mode, compression springs arranged along the axial direction are pressed between the spring ring seat and the adjusting ring seat, the spring ring seat is provided with a second sleeving ring part sleeved in the inner cavity of the static ring seat, a fixed part of a static ring of the mechanical seal assembly to be tested is clamped between the second sleeving ring part and the first sleeving ring part, and the elastic sealing ring is pressed between the fixed part of; an elastic sealing ring is pressed between the peripheral surface of the adjusting ring seat and the static ring seat; the standby sealing assembly comprises an adjusting ring seat, a fixed ring seat, an elastic sealing ring and an emergency adjusting mechanism, wherein the fixed ring seat is sleeved outside the rotary sealing main shaft in a watertight manner; the emergency adjusting mechanism is used for pulling the adjusting ring seat to move axially until the elastic sealing ring clamped on the emergency adjusting mechanism is driven to switch from a position in clearance fit with the fixed ring seat to a pressing position. In order to perform emergency sealing treatment in an unexpected situation.
Drawings
FIG. 1 is a perspective view of an embodiment of the present invention;
FIG. 2 is an enlarged view of a portion A of FIG. 1;
FIG. 3 is an enlarged view of a portion B of FIG. 2;
FIG. 4 is an exploded view of a mechanism for testing a partial end of a mechanical seal assembly according to an embodiment of the present invention;
FIG. 5 is an enlarged view of a portion C of FIG. 4;
FIG. 6 is an enlarged view of portion D of FIG. 4;
FIG. 7 is a schematic diagram of the rotary seal spindle, inner sleeve, outer sleeve, stationary ring seat, stationary ring and stationary ring seat of an embodiment of the present invention;
FIG. 8 is an enlarged view of E in FIG. 7;
FIG. 9 is an enlarged view of portion G of FIG. 7;
FIG. 10 is an enlarged view of portion F of FIG. 7;
FIG. 11 is an exploded view of the drive connection between the tachometer and the torque tester in an embodiment of the present invention;
FIG. 12 is an exploded view of the drive connection between the rotary drive motor and the clutch in an embodiment of the present invention;
FIG. 13 is a schematic diagram of an adjusting process of adjusting the set of flanged disks according to the embodiment of the present invention.
Detailed Description
The invention is further illustrated by the following examples and figures.
Examples
Referring to fig. 1 to 13, the mechanical seal testing device 1 with adjustable axial deflection of the sealing ring of the invention comprises a test bed base 10, a test cavity 11 mounted on the test bed base 10, a rotary seal spindle 2, a bearing seat 12, a coupler 13, a rotating speed torquer 193, a clutch mechanism 14, a flywheel 15, a rotary driving motor 16, an integrated pipeline system 17 and an adjustable bracket 18, and a main control cabinet 191 and a cooling water circulation machine 192 arranged beside the test bed base 10. In the present embodiment, the rotary drive motor 16 is an inverter motor. The clutch mechanism 14 includes an oil tank 140.
The sealed test chamber 30 is disposed on the test chamber 11, the rotary sealed spindle 2 is rotatably sleeved in the sealed test chamber 30, the rotary driving motor 16 drives the flywheel 15 to rotate by means of a flat key and spline housing connection, specifically, as shown in fig. 12, the inner spline housing 90 is fixedly connected to the rotor shaft 160 by means of the fit between the flat key 91 and the key slot 161 disposed on the output shaft end of the rotor shaft 160 of the rotary driving motor 16, and the outer spline housing 92 is fixedly connected to the input shaft end of the flywheel 15 coaxially, so that the axial displacement is isolated by means of the fit between the inner spline housing 90 and the outer spline housing 92, and the rotary displacement can be transmitted, that is, the axial displacement isolating mechanism disposed between the rotary driving motor 16 and the flywheel 15 is formed. The flywheel 15 is connected with the input shaft of the clutch mechanism 14 in a manner of conical interference connection and semicircular key connection. The output shaft of the clutch mechanism 14 is connected to the tachometer 13 by means of spline housing and flat key connection, specifically, as shown in fig. 11, the flat key 93 is engaged with the key groove 131 provided on the input shaft end of the input shaft 130 of the tachometer 13, so as to fixedly connect the inner spline housing 94 to the input shaft 130, and the outer spline housing 95 is fixed to the output shaft end of the clutch mechanism 14, so that the axial displacement is isolated by the engagement of the inner spline housing 94 and the outer spline housing 95, and the rotational displacement can be transmitted, that is, the axial displacement isolating mechanism is disposed between the tachometer 13 and the clutch mechanism 14. The rotational speed and torque meter 13 is connected with the rear end part of the rotary seal main shaft 2 through a coupler 13 so as to drive the rotary seal main shaft 2 to rotate.
The sealing test chamber 30 is provided with an extending side mounting shaft hole 31 and an extending side mounting shaft hole 32 which are coaxially arranged, and the rotary sealing main shaft 2 is rotatably sleeved in the sealing test chamber 30; the outer end of the rotary sealing main shaft 2 sequentially penetrates through the stretching-in side mounting shaft hole 31 and the stretching-out side mounting shaft hole 32, and the rotary sealing main shaft and the test cavity 11 are sealed by the auxiliary mechanical sealing assembly at the stretching-in side mounting shaft hole 31 and sealed by the mechanical sealing assembly to be tested at the stretching-out side mounting shaft hole 32.
In the present embodiment, as shown in fig. 4 to 6, the mechanical seal assembly seal to be tested includes a stationary ring 01 and a movable ring 02, which are detachably mounted on the shaft end 33 of the protrusion-side mounting shaft hole 32, i.e., on the left end portion of the test chamber 11, by means of a mounting mechanism. Specifically, the mounting mechanism comprises a mechanical seal mounting flange 4 which is detachably mounted on a shaft end 33 through a plurality of fixing bolts 34 which are uniformly distributed around a rotary seal main shaft 2, a static ring seat 50 which is detachably and watertight sleeved in the mechanical seal mounting flange 4, and a movable ring seat 60 which is detachably and watertight sleeved outside the rotary seal main shaft 2; the static ring 01 is arranged on the static ring seat 50 in a watertight manner, and the dynamic ring 02 is arranged on the dynamic ring seat 60 in a watertight manner; an axis deflection angle adjusting mechanism is installed between the mechanical seal mounting flange 4 and the shaft end 33, the axis deflection angle adjusting mechanism comprises an adjusting flange disc group 7 pressed between the end face of the mechanical seal mounting flange 4 and the end face of the shaft end 33, the adjusting flange disc group 7 comprises an adjusting flange disc 70 and a fixing flange disc 71, and through holes for fixing bolts 34 to pass through are formed in the two flange discs, 700 and 710 are respectively arranged on the two flange discs.
In the adjusting flange disc group 7, a first sealing washer is pressed between the ring surface of the adjusting flange disc 70 and the end surface of the shaft end 33, a second sealing washer is pressed between the ring surface of the fixed flange disc 71 and the end surface of the mechanical seal mounting flange 4, and a third sealing washer is pressed between the ring surfaces of the two flange discs, so that the mechanical seal mounting flange 4 is mounted on the left end part of the test cavity 11 in a watertight and detachable manner, namely, on the shaft end 33; in this embodiment, the gasket mounting grooves for mounting the third sealing gasket and the first sealing gasket are both disposed on the adjusting flange 71, that is, the adjusting flange 70 is provided with a gasket mounting groove concavely at the abutting position with the sealing gasket, specifically, the adjusting flange 71 is provided with a gasket mounting groove 711 for mounting the first sealing gasket and a gasket mounting groove 712 for mounting the second sealing gasket, and the mechanical seal mounting flange 4 is provided with a gasket mounting groove 409 for mounting the second sealing gasket, that is, the mechanical seal mounting flange 4 is provided with a gasket mounting groove concavely at the abutting position with the sealing gasket.
In the installation process, the mechanical seal mounting flange 4 and the adjusting flange disk group 7 are detachably fixed on the left end portion of the test cavity 11 by using a plurality of fixing bolts 34, specifically, the fixing bolts 34 sequentially pass through the mounting through holes arranged on the mechanical seal mounting flange 4, the through holes 700 arranged on the adjusting flange disk 70 and the through holes 710 arranged on the fixing flange disk 71, and then detachably screwed with the screw holes 3301 arranged on the shaft end 33. The axis of the rotary seal main shaft is taken as the normal line of the circle passing through the center of the circle where the central angle is located, the central angle of two adjacent fixing bolts 34 is the integral multiple of the central angle of two adjacent through holes on the flange plate, and therefore the fixing bolts 34 with the same number can be used for being matched with the flange plate groups 7 with multiple steps. The number of the fixing bolts 34 is usually 10 or more, so as to improve the adjustment accuracy.
As shown in fig. 7 to 10, a sleeve 35 is detachably fitted over the rotary seal spindle 2, and the sleeve 35 includes an inner sleeve 36 detachably fitted over the rotary seal spindle 2 and an outer sleeve 37 detachably fitted over the inner sleeve 36. Specifically, a first sealing collar 811 is pressed between the inner shaft sleeve 36 and the shaft shoulder 20 on the rotary sealing main shaft 2, an elastic sealing ring 813 is pressed between the first sealing collar 811 and the outer peripheral surface of the rotary sealing main shaft 2, and a sealing gasket 814 is pressed between the first sealing collar 811 and the inner end surface of the inner shaft sleeve 36; a lock nut 815 pressed against the outer end surface of the inner sleeve 36 is screwed to the outer end portion of the rotary seal spindle 2. The wall parts at two ends of the sleeve cavity of the outer sleeve 37 are supporting sleeved parts 371, 372 with inward convex structures, and a mounting gap 373 is reserved between the wall surface of the sleeve between the two supporting sleeved parts 371, 372 and the outer peripheral surface of the inner sleeve 36 so as to facilitate the mutual sleeving between the sleeves; a second sealing collar 821 and a third sealing collar 825 are pressed between the outer shaft sleeve 37 and a shaft shoulder 360 on the inner shaft sleeve 36, an elastic sealing ring 822 is pressed between the second sealing collar 821 and the outer peripheral surface of the inner shaft sleeve 36, a sealing gasket 823 is pressed between the third sealing collar 825 and the inner end surface of the outer shaft sleeve 37, and an elastic sealing ring 826 is pressed between the annular surfaces of the second sealing collar 821 and the third sealing collar 825; a lock nut 827 is screwed onto an outer end surface of the outer hub 37 at an outer end portion of the inner hub 36.
The movable ring seat 60 is detachably sleeved outside the outer shaft sleeve 37, specifically, the movable ring seat 60 is detachably fixed outside the outer shaft sleeve 37 by a set screw 831 arranged along the radial direction, and an elastic sealing ring 832 is pressed between the outer circumferential surfaces of the outer shaft sleeve 37, the movable ring 02 is detachably clamped on the movable ring seat 6, and the two are pressed with the elastic sealing ring 835 on the end surfaces, so that the movable ring seat 6 is detachably and watertight sleeved outside the rotary seal spindle 2. In the present embodiment, the thickness of the outer hub 37 is less than the thickness of the inner hub 36, specifically less than half thereof.
The static ring seat 50 is detachably mounted on the mechanical seal mounting flange 4 by matching the press ring 51 with the fastening bolt 833 arranged along the axial direction of the rotary seal main shaft 2, the static ring seat 50 is provided with a first sleeving ring part 501 sleeved in the inner cavity of the mechanical seal mounting flange and a fixed ring body part 502 tightly pressed between the press ring 51 and the end surface of the test cavity 11, an elastic sealing ring 834 is pressed between the outer peripheral surface of the first sleeving ring part 501 and the mechanical seal mounting flange 4, an inner shaft shoulder 503 is convexly arranged in the inner cavity of the static ring seat 50, an adjusting ring seat 52 and a spring ring seat 53 are sleeved between the inner shaft shoulder 503 and the press ring 51, a compression spring arranged along the axial direction of the seal rotary main shaft 2 is pressed between the spring ring seat 53 and the adjusting ring seat 52, the elastic restoring force of the compression spring forces the two to increase the distance in the axial direction, the spring ring seat 53 is provided with a second sleeving ring part 530 sleeved in the inner cavity of the static ring seat 50 and a ring body, the fixed part of the stationary ring 01 is clamped between the second sleeving ring part 530 and the first sleeving ring part 501, and an elastic sealing ring 835 is pressed between the fixed part and the inner circumferential surface of the first sleeving ring part 501; an elastic sealing ring 836 is pressed between the outer peripheral surface of the adjusting ring seat 52 and the stationary ring seat 50.
A standby sealing component 55 is arranged between the outer end part of the mechanical sealing mounting flange 4 and the outer end part of the rotary sealing main shaft 2 and is used for sealing a gap between the extending mounting shaft hole 32 which is originally sealed by the sealing component to be tested and extends out of the rotary sealing main shaft 2 in emergency; specifically, as shown in fig. 5 and 7, the spare seal assembly 55 includes an adjusting ring seat 52, a fixed ring seat 57 which is tightly sleeved outside the rotary seal spindle 2, an elastic seal ring 837 which is clamped on the adjusting ring seat 52, and an emergency adjusting mechanism; the emergency adjusting mechanism is used for driving the adjusting ring seat 52 to move along the axial direction of the rotary seal main shaft 2 until the elastic sealing ring 837 clamped on the adjusting ring seat is driven to switch from a position in clearance fit with the fixed ring seat 53 to a pressing position.
In the adjusting flange disc group 7, the two flange discs of the fixed flange disc 71 and the adjusting flange disc 70 are respectively designed to have a certain eccentric angle and an inclined plane angle according to the national standard of the full run-out tolerance, the axial line deflection amount of the sealing ring under different processing and mounting errors is simulated by rotating a certain angle, and the eccentric value caused by the full run-out error with the precision of 12 levels and above can be realized.
As shown in fig. 13, in the initial state, the axis 718 of the fixed flange 71 and the axis 708 of the adjusting flange 70 are arranged in a collinear manner and parallel to the axis of the rotary seal spindle 2, and there is no deflection angle between the axes of the two flanges, and the normal 719 and the normal 709 of the contact end surfaces of the two flanges are arranged in parallel, and both of the two flanges and the axis of the rotary seal spindle 2 form a deflection angle, and the deflection angles are equal, so that the axial deflection angle between the stationary ring 01 and the moving ring 02 is in the initial first state, and at this time, the deflection angle is usually adjusted to be zero; during the test, after the adjusting fixing bolts 34 pass through the corresponding through holes 700 on the adjusting flange plate 70, the flange plate 70 is rotated by a certain angle relative to the fixed flange plate 71, i.e. the axis 718 of the fixed flange plate 71 is deflected by a predetermined deflection angle relative to the axis 708 of the adjusting flange plate 70, so as to drive the axis of the mechanical seal mounting flange 4 to deflect by a predetermined deflection angle relative to the axis of the rotary seal spindle 2, i.e. the axis of the stationary ring 01 and the axis of the movable ring 02 are deflected by a certain deflection angle relative to each other. In the embodiment, the principle is realized by adopting the flange design, so that the impact can be effectively reduced, the stability of simulation tolerance in the operation process is ensured, and the service life of the test bed is prolonged.
Since in the present embodiment there are 18 fixing bolts 34 and there are 18 through holes matching with the fixing bolts on both flanges, these through holes 700, 710 are uniformly arranged around the axis of the rotary seal spindle 2, during the adjustment process, when the off-angle of the axis is adjusted, the adjustment of 18 gears can be realized, and each gear can be adjusted by rotating the rotatable adjusting flange 18 by one bolt position. The parts of the mechanical seal mounting flange 4, the static ring seat 50, the spring seat 53, the static ring 01 and the like which are coupled with the rotary seal spindle 2 are static parts, and a certain gap is reserved between the static parts and the rotary outer shaft sleeve 37, so that the axial angle of the rotary part is not affected, the movable ring 02 is clamped on the outer shaft sleeve 37 through the movable ring seat 60, the axial line is not changed, and the working condition that the axial deflection angle of the movable ring 02 and the static ring 01 is adjustable is realized.
The test cavity 11 is used for installing and testing mechanical seal assemblies of different models, and the replaceable mechanical seal installation flange 4 and the shaft sleeve 35 are adopted, including the replacement of the inner shaft sleeve 36 and the outer shaft sleeve 37. When the size of the tested mechanical seal assembly changes slightly, the static ring seat 50 and the spring seat 53 for clamping the static ring 01, the movable ring seat 60 for clamping the movable ring 02 and the outer shaft sleeve 37 can be replaced. When the dimensional variation is large, the above components and the inner hub 36 need to be replaced. Through the design, the installation requirements of different mechanical seals can be met. And meanwhile, an emergency sealing assembly is arranged, so that under the condition that the tested mechanical seal fails, the emergency seal is used, and greater leakage and other potential safety hazards are avoided.
In addition, the medium pressure transmitter, the eddy current displacement sensor, the temperature transmitter and the end face leakage liquid collecting device are arranged and used for obtaining medium temperature pressure parameters, moving ring displacement fluctuation quantity and sealing leakage quantity parameters in unit time so as to guide test condition setting and test result analysis. The temperature transmitter and the eddy current displacement sensor are installed in the test cavity 11 under the condition of pressure sealing by inserting the sealing plug into the sealing socket. The pressure transmitter is arranged at the water inlet.
The bearing seat 12 is connected with the test cavity 11 and used for supporting the rotary seal main shaft 2 and the test cavity 11 to ensure the stability of the rotary seal main shaft. The circulating water cavity is arranged and used for adjusting the temperature of the equipment, guiding away heat generated by running friction under the internal pressure of the equipment, keeping the stability of the material and running performance of the equipment and reducing the system error. Bear the weight that shaft coupling 13 brought more simultaneously, avoid rotational speed torquemeter 193 to bear radial force, effectively reduce rotational speed torquemeter 193 because the torque error that other power produced. And the vibration sensor is arranged at two orthogonal positions of the bearing seat and used for extracting vibration data.
The coupling 13 is connected between the rotary seal main shaft 2 and the rotating speed torquer 193, and ensures that the operation data of the mechanical seal to be tested is synchronous with the operation speed of the rotating speed torquer 193.
The rotating speed torquer 193 is connected with the rotary sealing spindle 2 and the clutch mechanism 14 through a coupler 13, a spline sleeve and a key connection respectively, and is used for acquiring the rotating speed and torque parameters of the equipment. Because the spline can slide axially, the spline connection can effectively avoid the transmission of axial force, thereby ensuring that the tachometer is not subjected to the axial force.
The clutch mechanism 14 adopts a wet-type multi-plate electromagnetic clutch, can provide large torque and rotation speed transmission, and has short response time and high bearing friction force. The device is used for simulating the rapid starting and stopping states of the device through a rapid joint and disconnection process. An oil tank 140 is also provided for supplying oil to the clutch on the one hand and for supporting the weight of the device on the other hand. The equipment weight includes the shafting weight connected to the tachometer 193 and the shafting weight connected to the flywheel 15 and part of the flywheel 15. By supporting the weight of the device, radial forces of the device can be effectively prevented from being transmitted to the tachometer 193 to cause torque errors. And effectively reduces the system error.
The flywheel 15 is connected with the clutch mechanism 14 and the rotary driving motor 16 through a conical surface interference connection, a round key and spline housing, and a flat key connection, respectively. For providing rotational inertia to assist in achieving rapid start-up of the apparatus, protecting the rotary drive motor 16, and reducing damage to the rotary drive motor 16 due to changes in external parameters during rapid engagement and disengagement of the clutch structure 14.
The adjustable bracket 18 is arranged at the lower part of the test cavity 11, is in contact with the test cavity 11, and is used for balancing system errors caused by the weight of the test cavity 11.
The integrated pipeline system 17 is arranged beside the bearing seat 12 and is connected with various devices through hydraulic pipelines, and comprises various required valves such as a pressure stabilizing tank, a small plunger pump, a reversing valve, a one-way valve, a stop valve and a safety valve, and devices such as a pressure gauge are installed. The device is used for controlling medium pressure in the test cavity 11, circulating water circulation of the bearing seat 12, water supply, water drainage and other functions.
The above devices are all installed on the test bed base 10. The test bed base 10 is used for supporting the equipment, keeping the relative position stability of each part, reducing the vibration of the equipment and reducing the system error. And the vibration sensor is also arranged and used for extracting vibration data.
A cooling circulating water machine 192 is arranged beside the test bed main body and is connected with the integrated pipeline system through a hydraulic pipeline. The circulating medium is used for adjusting the temperature of the circulating medium and providing a set temperature.
A main control cabinet 191 is arranged beside the test bed main body and is connected with the test bed through various electrical elements and circuits. The device comprises acquisition cards, a PLC, an industrial personal computer, a printer, a display screen, a touch screen and other devices, and a built-in test bed test system for acquiring and processing parameters of the test bed devices.
The specific work content is as follows:
the method comprises the following steps: firstly, according to the working condition of the required axial deflection angle, the adjusting flange plate 71 in the adjusting flange assembly group 7 is rotated by a corresponding angle, the positioning pins are placed to fix the relative positions of the flange plates, and the experimental equipment is installed. Then setting the temperature of the cooling water circulator 192, starting the cooling water circulator 192, opening and closing corresponding switches and valves in the integrated pipeline system 17, and filling the cooling cavity of the bearing seat 12 and the test cavity 11 with media. The integrated piping system 17 is operated and the corresponding valves are adjusted so that the cooling chamber of the bearing housing 12 begins to circulate. And then starting a pressurizing pump in the integrated pipeline system 17 to pressurize the test cavity 11, and adjusting the integrated pipeline system 17 after the preset pressure is reached. After the lubricating oil in the clutch oil tank 140 reaches a preset position, the sensors are electrified, the test system can work, and the preparation work is completed.
Step two: firstly, setting the clutch mechanism 14 to be in a disconnected state, starting the rotary driving motor 16, and setting the stable rotating speed of the rotary driving motor to be the highest rotating speed in a transient start-stop test; the rotation driving motor 16 rotates the flywheel 15 and the clutch mechanism 14 at a set rotation speed. When the test is started, the power supply of the clutch mechanism 14 is connected, the clutch is engaged, and the clutch rapidly drives the rotating speed torquer 193, the rotary seal main shaft 2 and the rotating ring 02 connected with the main shaft to rotate, so as to simulate the transient starting working condition.
Step three: when the vehicle is parked, the clutch is disconnected, and the main shaft and the sealing piece are parked after losing power.
In the test process, cooling water in the cooling cavity of the bearing seat 12 is continuously circulated to maintain the temperature stability. The integrated pipeline system 17 and the pressure stabilizing tank maintain the stable pressure in the test cavity. The sensors and the PLC, the single chip microcomputer, the industrial personal computer and the like in the control main cabinet 191 continuously obtain test parameters for analyzing detection results.
The adjustment from the non-axial deflection angle to the maximum deflection angle can be realized by changing the rotating angle of the adjusting flange plate 71, so that the performance test of the mechanical seal under different deflection angles can be carried out. The mechanical seal transient performance test under different starting acceleration can be carried out by changing the rotating speed of the rotary driving motor 16 and the rotational inertia of the flywheel 15.
If the performance test under the conventional stable operation condition is performed, the clutch is engaged only before the rotary drive motor 15 is started in the step two.
The beneficial effect of this embodiment is:
1. the invention provides a mechanical seal testing device with an adjustable seal ring axial deflection angle, which has the advantages of extremely small system error, compact structure and rich functions. Mechanical seals of different model sizes can be replaced without changing the test chamber itself.
2. The test device can realize the adjusting flange for adjusting the axial deflection angle of the sealing ring, has simple structure, can effectively reduce impact and control errors, ensures stable operation of the test bed, effectively reduces system errors and ensures accurate deflection angle control.
3. The test device has the advantages of compact structure of a transmission system, firm connection and good transmission effect, and can realize the quick start-stop working condition of mechanical seal. The support of oil tank can effectively restrict radial force and transmit for rotational speed torquemeter, and the spline housing allows axial displacement, consequently can not transmit axial force for rotational speed torquemeter, ensures rotational speed torquemeter data accuracy.
4. The test cavity can bear different medium types, the rotating speed, the pressure and the temperature of equipment are controlled through the variable frequency motor, the integrated pipeline system and the cooling circulating water machine, the variation range of the rotating speed, the pressure and the temperature is large, the truest working condition of mechanical sealing is further simulated, and the sealing working condition is fed back through various sensors.
5. The test cavity is provided with an emergency sealing assembly, and under the condition that the tested mechanical seal fails, the emergency seal is used, so that greater leakage and other potential safety hazards are avoided.
6. The bearing seat is provided with a circulating cooling system, so that the working performance of the test bed can be ensured to be stable, and system errors caused by temperature changes can be avoided.
Claims (10)
1. A mechanical seal test device with an adjustable seal ring axial deflection angle comprises a data acquisition system, a test cavity provided with a seal test chamber, a rotary seal main shaft and a rotary driving motor for driving the rotary seal main shaft to rotate; the rotary sealing main shaft is sleeved in the sealing test chamber and is sealed by the auxiliary mechanical sealing assembly at the mounting shaft hole at the extending side of the chamber and is sealed by the mechanical sealing assembly to be tested at the mounting shaft hole at the extending side of the chamber; the method is characterized in that:
a mechanical seal mounting flange is detachably mounted at the shaft end of the extending side mounting shaft hole through a plurality of fixing bolts uniformly distributed around the axis of the rotary seal main shaft; the mechanical seal mounting flange is internally detachably and watertight sleeved with a static ring seat for mounting a static ring to be tested; the rotating seal main shaft is externally detachably and watertight sleeved with a moving ring seat for mounting a moving ring to be tested; and a flange disc group used for adjusting the axial deflection angle is pressed between the mechanical seal mounting flange and the end surface of the shaft end in a watertight manner, when two flange discs in the flange disc group rotate relatively to zero degree, the deflection angle exists between the normal direction of the contact end surface and the axial of the rotary seal main shaft, and through holes for fixing bolts to pass through are formed in the flange discs.
2. The mechanical seal testing device of claim 1, wherein:
the rotary seal spindle is detachably sleeved with a shaft sleeve, and the mechanical seal mounting flange is detachably sleeved outside the shaft sleeve.
3. The mechanical seal testing device of claim 2, wherein:
the shaft sleeve comprises an inner shaft sleeve and an outer shaft sleeve, wherein the inner shaft sleeve is detachably sleeved outside the rotary sealing main shaft, and the outer shaft sleeve is detachably sleeved outside the inner shaft sleeve; the mechanical seal mounting flange is detachably sleeved outside the outer shaft sleeve; the thickness of the outer shaft sleeve is smaller than that of the inner shaft sleeve.
4. The mechanical seal testing device of claim 3, wherein:
a first sealing lantern ring is pressed between the inner shaft sleeve and a shaft shoulder on the rotary sealing main shaft, an elastic sealing ring is pressed between the first sealing lantern ring and the outer peripheral surface of the rotary sealing main shaft, a sealing gasket is pressed between the first sealing lantern ring and the inner end surface of the inner shaft sleeve, and a locking nut pressed on the outer end surface of the inner shaft sleeve is screwed at the outer end part of the rotary sealing main shaft; the wall parts of two ends of the sleeve cavity of the outer sleeve are supporting sleeving parts with inward convex structures, and a mounting gap is reserved between the wall surface between the two supporting sleeving parts and the outer peripheral surface of the inner sleeve; a second sealing lantern ring is pressed between the outer shaft sleeve and a shaft shoulder on the inner shaft sleeve, an elastic sealing ring is pressed between the second sealing lantern ring and the outer peripheral surface of the inner shaft sleeve, and a sealing gasket is pressed between the second sealing lantern ring and the inner end surface of the outer shaft sleeve; and a locking nut pressed on the outer end surface of the outer shaft sleeve is screwed at the outer end part of the inner shaft sleeve.
5. A mechanical seal testing device according to any of claims 1 to 4, characterized in that:
in the flange disc group, a sealing washer is pressed between the ring surface of the fixed flange disc and the end surface of the test cavity, a sealing washer is pressed between the ring surface of the adjusting flange disc and the end surface of the mechanical seal mounting flange, and a sealing washer is pressed between the ring surfaces of the two flange discs; the abutting part of the fixed flange plate and the sealing washer is concavely provided with a gasket mounting groove, and the abutting part of the mechanical seal mounting flange and the sealing washer is concavely provided with a gasket mounting groove.
6. A mechanical seal testing device according to any of claims 1 to 4, characterized in that:
the number of the fixing bolts is more than ten;
and taking the axis as the normal line of the circle passing through the center of the circle where the central angle is located, wherein the central angle of two adjacent fixing bolts is an integral multiple of the central angle of two adjacent through holes on the flange plate.
7. A mechanical seal testing device according to any of claims 1 to 4, characterized in that:
the rotary driving motor is connected with the inner end part of the rotary sealing main shaft through a coupler and a clutch which are sequentially arranged, a flywheel is distributed between an input shaft of the clutch and a rotor shaft of the rotary driving motor, a rotating speed and torque tester is distributed between the coupler and an output shaft of the clutch, and a supporting bearing mechanism is installed on the shaft end side of the rotary sealing main shaft of the test cavity; the supporting bearing mechanism comprises a supporting bearing sleeved outside the rotary seal main shaft and a bearing seat connected with the test cavity, and a circulating cooling water channel is arranged in the bearing seat.
8. The mechanical seal testing device of claim 7, wherein:
the input shaft end of the coupler and the output shaft end of the clutch and/or the input shaft end of the flywheel and the output shaft end of the rotor of the rotary driving motor are in rotary transmission connection through an axial displacement isolating mechanism;
the axial displacement isolating mechanism comprises an inner spline housing and an outer spline housing which are matched; one of the adjacent input shaft end and the output shaft end is fixedly connected with the internal spline sleeve, and the other one is fixedly connected with the external spline sleeve.
9. A mechanical seal testing device according to any of claims 1 to 4, characterized in that:
and a temperature monitoring sensor and a water pressure monitoring sensor with detection ends positioned in the sealed test chamber are arranged on the test chamber body in a watertight manner.
10. A mechanical seal testing device according to any of claims 1 to 4, characterized in that:
a spare sealing assembly is arranged between the outer end of the mechanical sealing mounting flange and the outer end of the rotary sealing main shaft;
the static ring seat is detachably arranged on the mechanical seal mounting flange through the matching of a pressing ring and fastening bolts arranged along the axial direction of the rotary seal main shaft, the static ring seat is provided with a first sleeving ring part sleeved in the inner cavity of the mechanical seal mounting flange, an elastic sealing ring is pressed between the outer peripheral surface of the first sleeving ring part and the mechanical seal mounting flange, an inner shaft shoulder is convexly arranged in the inner cavity of the static ring seat, an adjusting ring seat and a spring ring seat are sleeved between the inner shaft shoulder and the pressing ring in a sleeved mode, a compression spring arranged along the axial direction is pressed between the spring ring seat and the adjusting ring seat, the spring ring seat is provided with a second sleeving ring part sleeved in the inner cavity of the static ring seat, and a fixed part of a static ring of the mechanical seal assembly to be tested is clamped between the second sleeving ring part and the first sleeving ring part, an elastic sealing ring is pressed between the first sleeve ring part and the inner circumferential surface of the first sleeve ring part; an elastic sealing ring is pressed between the peripheral surface of the adjusting ring seat and the static ring seat;
the standby sealing assembly comprises the adjusting ring seat, a fixed ring seat which is sleeved outside the rotary sealing main shaft in a watertight manner, an elastic sealing ring which is clamped on the adjusting ring seat, and an emergency adjusting mechanism; the emergency adjusting mechanism is used for pulling the adjusting ring seat to move along the axial direction until the elastic sealing ring clamped on the adjusting ring seat is driven to switch from a position in clearance fit with the fixed ring seat to a pressing position.
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| CN201910276421.XA CN109932169B (en) | 2019-04-08 | 2019-04-08 | Mechanical seal test device with adjustable seal ring axis deflection angle |
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| CN112179690B (en) * | 2020-09-04 | 2022-08-05 | 沈阳工业大学 | Test bed for testing sealing performance of heavy pressure centrifuge |
| CN115753032B (en) * | 2021-09-02 | 2024-02-13 | 中国石油天然气集团有限公司 | Test device, system and method for top drive flushing pipe assembly test |
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